Distribution of Foraging Rhinoceros Auklets in the Strait of Juan de Fuca, Washington

Wahl, Terence R.; Speich, Steven M.

doi:10.2307/3536766

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…Lewis & Sharpe 1987, Simard et al 2002. These locations also have special significance as foraging habitats for breeding (Wilson & Manuwal 1986, Wahl & Speich 1994 and this study) and migratory (Braune & Gaskin 1982 and this study) marine birds. Therefore, tidal-coupling across plankton → planktivorous-fishes → fish-predator linkages is likely to be an important general mechanism structuring nearshore marine predator-prey interactions and food web dynamics.…”

Section: General Importance Of Tidal-couplingmentioning

confidence: 75%

Mixed species aggregations feeding upon herring and sandlance schools in a nearshore archipelago depend on flooding tidal currents

Zamon¹

2003

Mar. Ecol. Prog. Ser.

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Tidal rips and jets are common features associated with archipelagos and complex coastlines. In habitats where rips and jets develop, energy flow to piscivorous predators is hypothesized to be strongly associated with tidal phase due to interactions between currents, plankton, and schooling planktivorous fishes (the 'tidal coupling hypothesis'). This study tests 1 component of the tidal coupling hypothesis, that the feeding activity of piscivorous predators and the availability of planktivorous fishes are both strongly associated with the same tidal phase. During 1994 to 1997, I made visual counts of actively feeding, mixed-species seabird flocks and hydroacoustic measurements of the relative abundance and distribution of schooling fishes. Median feeding activity, median backscatter m -1 transect, and median prey encounter probabilities were greatest during the tidal periods Slow flood 1 and Fast flood. Positive feeding anomalies and positive prey-encounter anomalies were significantly associated with tidal flood phases, but positive backscatter anomalies were not. The results support the tidal-coupling hypothesis, but suggest that changes in the distribution or behavior of schooling fish are as important as, if not more important than, changes in relative fish abundance when determining prey availability and predator foraging-success. The data show that tidal currents can play an important role in structuring nearshore predator-prey interactions.

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Section: General Importance Of Tidal-couplingmentioning

confidence: 75%

Mixed species aggregations feeding upon herring and sandlance schools in a nearshore archipelago depend on flooding tidal currents

Zamon¹

2003

Mar. Ecol. Prog. Ser.

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“…Rhinoceros Auklets breeding on the U.S. west coast have recently increased significantly in number, despite the recent period of ocean warming with more frequent severe El Niños and fewer La Niñas (Ainley et al 1994, Boersma 1998. Auklets from Protection Island travel considerable distances within Washington's inner coastal waters in search for food (Wahl and Speich 1994). Since Rhinoceros Auklets are nocturnal with respect to colony visitation (Wilson and Manuwal 1986), they have considerable time during the extended daylight hours of summer in search of distant and patchy food supplies.…”

Section: Discussionmentioning

confidence: 99%

Transformations at High Latitudes: Why Do Red Knots Bring Body Stores to the Breeding Grounds?

Morrison

Davidson²,

Piersma

2005

Condor

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Brown Pelicans (Pelecanus occidentalis) plunge dive into water to capture fish with highly distensible pouches. During prey capture, the pouch may expand to hold 11 L of water and the mandibular rami may bow from a resting position of 5 cm to over 15 cm. We compared mineralization of two bending regions of the mandible with a nonbending region, and examined cross-sectional morphology to determine if mineral content and shape play a role in mandibular bending. A rostral bending zone, adjacent to the mandibular symphysis, possessed only about 20% mineral content, significantly less than the lateral bending zone and the rigid caudal mandible, both comprised of over 50% mineral content. Additionally, the rostral zone was solid in cross section, facilitating bending, whereas the lateral zone was made up of bones joined by connective tissue. This latter morphology permits movement between the bones even though there was relatively high mineralization. We suggest that mineral content may be an overlooked component to cranial kinesis in birds.

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“…To some extent, starting from [33] and modifying the approach adopted there, the authors [35] evaluated the potential effect of oil pollution on seabirds in each habitat in Puget Sound, Washington State [49,50]. They developed and described a relatively simpler method of calculating the bird oil index (BOI), which quantitatively took into account various aspects of the behavior, biology, distribution, and abundance of seabirds, as follows:…”

Section: The Bird/habitat Oil Index: a Habitat Vulnerability Index Ba...mentioning

confidence: 99%

The Issue of Using Ordinal Quantities to Estimate the Vulnerability of Seabirds to Oil Spills

Shavykin

Karnatov

2020

JMSE

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Oil spills can have a serious negative effect on seabirds. Numerous studies have been carried out for relative vulnerability assessment of seabirds to oil, with the majority of such works based on ordinal quantities. This study aims to assess (from the aspect of measurement theory) the methodological approaches used for calculating the vulnerability of seabirds to oil spills, and corresponding conclusions. We assess several well-known works on the vulnerability of seabirds (1979–2004). We consider the effect on derived conclusions of (a) monotonic initial data transformations on an ordinal scale, (b) multiplication operations on the same scale, and (c) the replacement of initial metric data to ordinal. Our results show the following: (a) the conclusions for arithmetic operations may not be saved with permissible monotonic transformations of ordinal quantities; (b) partially uncertain results can be obtained with arithmetic operations on an ordinal scale as compared with metric; (c) the replacement of metric values to scores changes the real relationships among initial data and affects the final result. Thus, conclusions in works which use arithmetic operations with ordinal quantities cannot be considered to be justified and correct, since they are based on unacceptable operations and, quite often, on the distorted original data.

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Distribution of Foraging Rhinoceros Auklets in the Strait of Juan de Fuca, Washington

Cited by 9 publications

References 4 publications

Mixed species aggregations feeding upon herring and sandlance schools in a nearshore archipelago depend on flooding tidal currents

Mixed species aggregations feeding upon herring and sandlance schools in a nearshore archipelago depend on flooding tidal currents

Transformations at High Latitudes: Why Do Red Knots Bring Body Stores to the Breeding Grounds?

The Issue of Using Ordinal Quantities to Estimate the Vulnerability of Seabirds to Oil Spills

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